EP0333358A2 - Multiple-strand torsion spring and method of forming the same - Google Patents
Multiple-strand torsion spring and method of forming the same Download PDFInfo
- Publication number
- EP0333358A2 EP0333358A2 EP89302196A EP89302196A EP0333358A2 EP 0333358 A2 EP0333358 A2 EP 0333358A2 EP 89302196 A EP89302196 A EP 89302196A EP 89302196 A EP89302196 A EP 89302196A EP 0333358 A2 EP0333358 A2 EP 0333358A2
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- EP
- European Patent Office
- Prior art keywords
- wires
- spring
- sections
- end portions
- zone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F3/00—Coiling wire into particular forms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F35/00—Making springs from wire
- B21F35/003—Multi-filament springs, e.g. made of stranded, braided, cable or multi-filament material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F3/00—Coiling wire into particular forms
- B21F3/02—Coiling wire into particular forms helically
- B21F3/04—Coiling wire into particular forms helically externally on a mandrel or the like
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49609—Spring making
- Y10T29/49611—Spring making for vehicle or clutch
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49787—Obtaining plural composite product pieces from preassembled workpieces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49789—Obtaining plural product pieces from unitary workpiece
- Y10T29/49798—Dividing sequentially from leading end, e.g., by cutting or breaking
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
- Y10T29/49881—Assembling or joining of separate helix [e.g., screw thread]
Definitions
- This invention relates to multiple-strand torsion springs and to methods of forming the same.
- Such a spring should have the multiple wires that form its coiled portion unconnected to each other over a major part of its length, so that each coiled wire of the spring is capable of functioning independently. However, all of the wires at least at one end of the spring should be permanently secured together.
- an important object of this invention lies in providing a highly efficient and effective method for making multiple-strand helical springs in which the strands are joined together at least at one end, and preferably at both ends, of the spring.
- No folding of wire is involved and, if desired, the spring may be formed of more than two strands similarly joined together at opposite ends of the spring but always with the strands of the coiled portions free to move or slide (to a limited extent) in relation to each other over a major part of the length of the spring.
- the wire is cut only after each helical spring has been wound using a standard torsion machine.
- such cutting or severing occurs simultaneously with a welding step performed at a measured distance (which constitutes the developed length of a spring) from the cutting point so that, during a successive cycle of operation, the parallel strands of wire will be advanced and the next cutting operation will occur at (or immediately adjacent to) the welded zone produced during the preceding cycle.
- the cut is made through the welded zone so that the strands on opposite sides of the cut remain welded together; however, as brought out hereinafter, the cut may alternatively be made immediately in advance of the welded zone so that each spring, in its final form, has its strands joined together only at one end of that spring.
- a method of forming helical torsion spring composed of a plurality or parallel, coiled strands of spring wire with such strands being unconnected along a major part of their length but being joined together at least at one end of said spring, comprises the steps of
- the wires may be unwound from separate supply spools and guided in a straight path towards the mandrel of a torsion coiling machine.
- each wire may be considered to have integral first, second and third sections of equal length with the first sections of the parallel wires having their leading end portions welded together in a first zone of permanent connection.
- Such wires are also welded together in a second zone of connection spaced from the first zone and located along a defined stretch of wire that includes the trailing end portions of the first sections and the leading end portions of the second sections.
- the parallel wires are advanced, the first sections are progressively wound about the mandrel of the torsion machine.
- the coiling operation is momentarily interrupted when a selected number of coils have been formed and, during such interruption, all of the wires are transversely severed at a point along the defined stretch and are welded together, preferably simultaneously with the severing step, at a third zone of connection located behind the second zone at a distance equal to the distance between the first and second zones or a multiple thereof.
- the severing step involves severing the wires at a point within the longitudinal limits of the second zone of connection so that, following that severing step, the trailing end portions of the wires of the first sections remain connected to each other and the leading end portions of the wires of the second sections also remain connected to each other.
- a single welding step therefore functions in permanently connecting the ends of the wires for each of two successively-wound torsion springs.
- the severing may occur at a point ahead of the second zone of connection so that the trailing end portions of the wires of the first sections become disconnected from each other while the leading end portions of the wires of the second sections remain permanently connected by the weld.
- the steps of arranging, winding, severing, and welding are continued in repeated cycles of operation with a completed coil spring being formed and released during each cycle of the progressive manufacturing procedure.
- the result of such a method is a helical torsion spring having two or more spring wires disposed in parallel, contiguous relation and arranged in a helix composed of a series of coaxial coils.
- a helical torsion spring comprises a plurality of spring wires disposed in parallel, contiguous relation and arranged in a helix composed of a series of coaxial coils; said wires being unconnected and free for limited movement relative to each other along a major portion of the length of said coils; each of said wires including a pair of end portions at opposite ends of said helix; said end portions of all of said wires at least at one end of said helix being welded together.
- the wires are unconnected and capable of limited independent movement along a major part of the length of the spring but all of the wires are permanently joined by welding at least at one end of the spring.
- the opposite ends of the srping have all the wires welded together at these points.
- the numeral 10 generally designates a spring-winding machine or, as it is commonly called, a torsion machine, for winding coil springs from wire stock.
- a spring-winding machine or, as it is commonly called, a torsion machine, for winding coil springs from wire stock.
- Such machines are well known in the industry and, except for certain distinctive features described below, the apparatus depicted in the drawings is conventional.
- Characteristically, such a machine includes a rotatable mandrel or spindle 11 intermittently driven by an electric motor or other suitable power means 12.
- a cath pin or lug 13 is mounted on the spindle and is spaced from a reduced neck portion 11a of the sprindle so that the end of spring wire stock may be temporarily entrapped between the pin and the neck of the sprindle.
- An apertured quill or guide member 14 is mounted on the frame of the machine and directs the wire stock towards the mandrel.
- a feed mechanism which may take the form of a pair of feed rollers 15 (Fig. 5), feeds the wire stock through the quill and towards the rotatable mandrel.
- a reciprocable cutter blade 16 slides against the face of quill 14 across its opening to shear or sever the wire stock at the completion of each winding cycle. It is to be understood that other types of cutting means might be utilized to perform the same function, and that all of the structure so far described is typically found in a conventional spring-winding machine.
- machine 10 is capable of processing two or more wires W1 and W2 simultaneously. Only two such wires are shown in the drawings, but it is to be understood that a greater number may be provided.
- the wire stock extends from supply means 17 and 18 which may take the form of large supply rolls or spools of wire.
- the feed means 15 directs the plural wires in straight, parallel, contiguous relation through the guide passage or aperture of quill 14 towards winding mandrel or spindle 11.
- a welding station including a pair of welding electrodes 19 is disposed between the supply rolls and the quill and, when activated, such electrodes spot weld portions of wires W1 and W2 together.
- the wires are arranged so that they are equidistant from the rotational axis 11b of spindle 11. While in most cases the wires would be of circular cross section, there is no requirement that that be the case. For example, such wires may be of rectangular, oval, or polygonal section as long as the cross sectional configuration of each wire is uniform throughout its length. Also, while spring steel would be their normal composition, such wires may be formed of other suitable materials having similar properties.
- wires W1 and W2 are advanced through quill 14 with blade 16 in its retracted condition and with the non-rotating spindle precisely oriented so that the leading ends of the wires pass between cath pin 13 and the spindle's reduced neck portion 11a.
- the spindle is then rotated in the direction indicated by arrow 20 and, at the same time, is progressively retracted or raised axially as indicated by arrow 21.
- the wires are played onto the rotating spindle and, as the spindle retracts axially, are wound upon the reduced portion 11a of the spindle until a predetermined number of coils have been formed (Figure 3).
- the relationship between the rotational and axial speeds of the spindle or mandrel may be controlled so that the pitch of the spring coils may be varied to meet manufacturing requirements.
- successive coils of the spring may be formed on the spindle in contact with each other or, alternatively, may be spaced apart any selected distance.
- the advancing, winding, and cutting steps are synchronized with a welding step so that the lengths of the plural wires that form each finished spring have their ends permanently connected together at one end, and preferably at both ends, of the spring.
- a preferred construction is depicted in Figure 4 where it will be seen that spring 30 has a plurality of coaxial coils 31 which terminate at opposite ends of the spring in a pair of end portions 32 that have their plural strands or wires W1 and W2 welded together at 33. Throughout the remainder of the spring, wires W1 and W2 are unconnected and are therefore capable of limited independent displacement or flexure.
- spring 30 should have its end portions 32 projecting tangentially away from the cylindrical body of the coil spring as clearly indicated in Figure 4.
- the parallel wires W1, W2 may be considered as being composed of three undivided sections 40, 41 and 42 of equal length.
- the length of each such section is the length of each of a plurality of wires W1, W2 required to form a completed spring 30.
- wires W1, W2 are straight and the leading end portions of the wires the constitute the first section 40 are welded together in a first zone of connection represented by numeral 43.
- Wires W1 and W2 are also welded together in a second zone of connection 44 that is spaced from the first zone 43 and is located along a stretch of wire 45 that includes the trailing end portions 46 of the wires W1, W2 of the first section and the leading end portions 47 of the wires of the second section.
- the parallel, contiguous, and substantially straight wires W1, W2 are advanced together through quill 14 as spindle 11 begins to rotate.
- welding means 19 is activated to permanently secure the wires together in a third zone of connection 48 ( Figure 6).
- the spacing between welded zones 47 and 48 is the same as the original linear distance between welded zones 43 and 44 -- that is, the developed length of the wires from which a given spring is to be formed. It is to be understood, however, that to achieve such a result the welding station 19 need not be spaced from cutter 16 the same distance as the length of each of the sections 40, 41, or 42 but may be spaced from that cutter a distance equal to a multiple of such length. In either case, a similar result will be obtained.
- a spring similar to coil spring 30 but with the wires thereof joined together by welding at only one end of the spring may be readily formed by simply severing the wires along stretch 45 at a point immediately in front of the zone of welded connection 44 ( Figure 6A).
- each welded zone 44, 48 may instead be formed as a pair of closely spaced welded portions with the transverse cut by blade 16 extending between the pair of such portions of each weld.
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- Engineering & Computer Science (AREA)
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Abstract
Description
- This invention relates to multiple-strand torsion springs and to methods of forming the same.
- Multiple-strand helical springs have been known in the past and are believed particularly to be useful in torsion spring applications, such as in providing a return force for the throttle shaft of an automotive vehicle, because of their safety advantages. Should breakage occur in only one strand of the wire such a spring, the return force would be reduced, but the spring would not normally become completely disabled or inoperative.
- Such a spring, to be effective, should have the multiple wires that form its coiled portion unconnected to each other over a major part of its length, so that each coiled wire of the spring is capable of functioning independently. However, all of the wires at least at one end of the spring should be permanently secured together.
- It has been previously known to provide a double-wire torsion spring construction in which the two wires are integral portions of a single length of wire that, at the commencement of a manufacturing operation, is first folded upon itself at its midpoint to form a pair of parallel strands. The folded end is then fed into a torsion winding machine where the double strands are simultaneously coiled in a manner similar to that commonly used in connection with the forming of single-wire helical torsion springs.
- It is believed evident that such a construction would be time-consuming and expensive to manufacture. For each spring so manufactured on a one-at-a-time basis, a double length of wire must first be cut from stock and then folded upon itself. After flattening the fold to reduce it in thickness or width, the folded end must then be fed into the torsion spring winding machine. Continuous operation is not possible because each piece of wire must be separately cut and folded before a winding step is commenced. In addition to these manufacturing complexities, a double-wire torsion spring of folded-wire construction has the disadvantages of inherent weakness and risk of fracture at the point of the fold. Furthermore, should permanent attachment of the wires at the opposite end of the spring be desired (especially in view of such weaknesses at the folded end of the spring), a separate, subsequent welding step would be necessary.
- Accordingly, an important object of this invention lies in providing a highly efficient and effective method for making multiple-strand helical springs in which the strands are joined together at least at one end, and preferably at both ends, of the spring. No folding of wire is involved and, if desired, the spring may be formed of more than two strands similarly joined together at opposite ends of the spring but always with the strands of the coiled portions free to move or slide (to a limited extent) in relation to each other over a major part of the length of the spring. The wire is cut only after each helical spring has been wound using a standard torsion machine. In a preferred embodiment of the method, such cutting or severing occurs simultaneously with a welding step performed at a measured distance (which constitutes the developed length of a spring) from the cutting point so that, during a successive cycle of operation, the parallel strands of wire will be advanced and the next cutting operation will occur at (or immediately adjacent to) the welded zone produced during the preceding cycle. Ideally, the cut is made through the welded zone so that the strands on opposite sides of the cut remain welded together; however, as brought out hereinafter, the cut may alternatively be made immediately in advance of the welded zone so that each spring, in its final form, has its strands joined together only at one end of that spring.
- According to the present invention then, a method of forming helical torsion spring composed of a plurality or parallel, coiled strands of spring wire with such strands being unconnected along a major part of their length but being joined together at least at one end of said spring, comprises the steps of
- (a) arranging a plurality of wires in substantially parallel, contiguous relation; each of said wires including first, second and third integral sections of equal length with said first sections having leading end portions welded together in a first zone of connection; said wires also being welded together in a second zone of connection spaced from said first zone and location along a stretch of wire that includes trailing end portions of said first sections and leading end portions of said second sections;
- (b) winding said first sections, starting at a point adjacent the leading end portions thereof, about a mandrel to coil said parallel first sections into a plural-strand helix while simultaneously longitudinally advancing said second and third sections;
- (c) and thereafter transversely severing said wires along said stretch and welding said wires together in a third zone of connection spaced behind said second zone a distance equal to the distance between said first and second zones or a multiple thereof.
- The wires may be unwound from separate supply spools and guided in a straight path towards the mandrel of a torsion coiling machine. Along that path, each wire may be considered to have integral first, second and third sections of equal length with the first sections of the parallel wires having their leading end portions welded together in a first zone of permanent connection. Such wires are also welded together in a second zone of connection spaced from the first zone and located along a defined stretch of wire that includes the trailing end portions of the first sections and the leading end portions of the second sections. As the parallel wires are advanced, the first sections are progressively wound about the mandrel of the torsion machine. The coiling operation is momentarily interrupted when a selected number of coils have been formed and, during such interruption, all of the wires are transversely severed at a point along the defined stretch and are welded together, preferably simultaneously with the severing step, at a third zone of connection located behind the second zone at a distance equal to the distance between the first and second zones or a multiple thereof.
- In a preferred embodiment, the severing step involves severing the wires at a point within the longitudinal limits of the second zone of connection so that, following that severing step, the trailing end portions of the wires of the first sections remain connected to each other and the leading end portions of the wires of the second sections also remain connected to each other. A single welding step therefore functions in permanently connecting the ends of the wires for each of two successively-wound torsion springs. Alternatively, the severing may occur at a point ahead of the second zone of connection so that the trailing end portions of the wires of the first sections become disconnected from each other while the leading end portions of the wires of the second sections remain permanently connected by the weld. In any case, the steps of arranging, winding, severing, and welding are continued in repeated cycles of operation with a completed coil spring being formed and released during each cycle of the progressive manufacturing procedure.
- The result of such a method is a helical torsion spring having two or more spring wires disposed in parallel, contiguous relation and arranged in a helix composed of a series of coaxial coils.
- According to the present invention, a helical torsion spring comprises a plurality of spring wires disposed in parallel, contiguous relation and arranged in a helix composed of a series of coaxial coils; said wires being unconnected and free for limited movement relative to each other along a major portion of the length of said coils; each of said wires including a pair of end portions at opposite ends of said helix; said end portions of all of said wires at least at one end of said helix being welded together.
- The wires are unconnected and capable of limited independent movement along a major part of the length of the spring but all of the wires are permanently joined by welding at least at one end of the spring. In a preferred form of the invention, the opposite ends of the srping have all the wires welded together at these points.
- The invention will now be further described by way of examples with reference to the accompanying drawings, in which:-
- Fig. 1 is a somewhat schematic side elevational view depicting an apparatus for performing the method of this invention;
- Fig. 2 is an underside view of the apparatus of Fig. 1;
- Fig. 3 is an elevational view similar to Fig. 1, but illustrating the apparatus at a later stage of operation;
- Fig. 4 is a perspective view of a coil spring formed by the method of this invention;
- Fig. 5 is a schematic view showing a first stage in the method;
- Fig. 6 illustrates a second or subsequent stage or cycle in such method, and
- Fig. 6A is a fragmentary view similar to part of Fig. 6, but depicting a variation of the manufacturing method.
- Referring to Figs. 1 to 3 of the drawings, the
numeral 10 generally designates a spring-winding machine or, as it is commonly called, a torsion machine, for winding coil springs from wire stock. Such machines are well known in the industry and, except for certain distinctive features described below, the apparatus depicted in the drawings is conventional. Characteristically, such a machine includes a rotatable mandrel or spindle 11 intermittently driven by an electric motor or other suitable power means 12. A cath pin orlug 13 is mounted on the spindle and is spaced from a reduced neck portion 11a of the sprindle so that the end of spring wire stock may be temporarily entrapped between the pin and the neck of the sprindle. An apertured quill orguide member 14 is mounted on the frame of the machine and directs the wire stock towards the mandrel. A feed mechanism, which may take the form of a pair of feed rollers 15 (Fig. 5), feeds the wire stock through the quill and towards the rotatable mandrel. Areciprocable cutter blade 16 slides against the face ofquill 14 across its opening to shear or sever the wire stock at the completion of each winding cycle. It is to be understood that other types of cutting means might be utilized to perform the same function, and that all of the structure so far described is typically found in a conventional spring-winding machine. - Unlike conventional equipment, however,
machine 10 is capable of processing two or more wires W1 and W2 simultaneously. Only two such wires are shown in the drawings, but it is to be understood that a greater number may be provided. The wire stock extends fromsupply means quill 14 towards winding mandrel or spindle 11. A welding station including a pair ofwelding electrodes 19 is disposed between the supply rolls and the quill and, when activated, such electrodes spot weld portions of wires W1 and W2 together. - It will be observed that the wires are arranged so that they are equidistant from the
rotational axis 11b of spindle 11. While in most cases the wires would be of circular cross section, there is no requirement that that be the case. For example, such wires may be of rectangular, oval, or polygonal section as long as the cross sectional configuration of each wire is uniform throughout its length. Also, while spring steel would be their normal composition, such wires may be formed of other suitable materials having similar properties. - In the operation of the apparatus, wires W1 and W2 are advanced through
quill 14 withblade 16 in its retracted condition and with the non-rotating spindle precisely oriented so that the leading ends of the wires pass betweencath pin 13 and the spindle's reduced neck portion 11a. The spindle is then rotated in the direction indicated byarrow 20 and, at the same time, is progressively retracted or raised axially as indicated byarrow 21. The wires are played onto the rotating spindle and, as the spindle retracts axially, are wound upon the reduced portion 11a of the spindle until a predetermined number of coils have been formed (Figure 3). The relationship between the rotational and axial speeds of the spindle or mandrel may be controlled so that the pitch of the spring coils may be varied to meet manufacturing requirements. Thus, by controlling the rate of axial retraction of the spindle in relation to its rotational speed, successive coils of the spring may be formed on the spindle in contact with each other or, alternatively, may be spaced apart any selected distance. As soon as forward rotation of the spindle has ceased, rotation is momentarily reversed to accommodate slight springing-back of the spring andblade 16 then extends to shear wires W1 and W2, and the formed helical spring is automatically released from the reduced end portion 11a of the mandrel. The spindle then descends to its original position and the process is repeated. - In the method of this invention, the advancing, winding, and cutting steps are synchronized with a welding step so that the lengths of the plural wires that form each finished spring have their ends permanently connected together at one end, and preferably at both ends, of the spring. A preferred construction is depicted in Figure 4 where it will be seen that
spring 30 has a plurality ofcoaxial coils 31 which terminate at opposite ends of the spring in a pair ofend portions 32 that have their plural strands or wires W1 and W2 welded together at 33. Throughout the remainder of the spring, wires W1 and W2 are unconnected and are therefore capable of limited independent displacement or flexure. For use as a torsion spring,spring 30 should have itsend portions 32 projecting tangentially away from the cylindrical body of the coil spring as clearly indicated in Figure 4. - The method by which the
spring 30 is formed, and the inclusion of the welding step as part of that method, are schematically revealed in Figures 5 and 6. Referring to Figure 5, the parallel wires W1, W2, may be considered as being composed of threeundivided sections spring 30. In the initial operating stage indicated in Figure 5, wires W1, W2 are straight and the leading end portions of the wires the constitute thefirst section 40 are welded together in a first zone of connection represented bynumeral 43. - Wires W1 and W2 are also welded together in a second zone of
connection 44 that is spaced from thefirst zone 43 and is located along a stretch ofwire 45 that includes the trailingend portions 46 of the wires W1, W2 of the first section and theleading end portions 47 of the wires of the second section. The parallel, contiguous, and substantially straight wires W1, W2 are advanced together throughquill 14 as spindle 11 begins to rotate. As already described, such rotation winds the parallel wires of thefirst section 40 about the neck 11a of the spindle until a predetermined number of coils have been formed, at which time the winding operation is stopped, them momentarily reversed to accommodate springing-back of the spring, andblade 16 extends to sever the wires within the defined stretch 45 (Figure 6). In the preferred embodiment, the transverse severing occurs directly through the mid-point of weldedzone 44 with the result thatspring 30 has its wires welded together at opposite ends 43 and 46 and, further, that the leading ends of the wires of the incrementally-advancedsecond section 41 are also secured together by a portion of thesame weld 44. - At the same time that the advancement of the wires W1, W2 is interrupted for the severing step, welding means 19 is activated to permanently secure the wires together in a third zone of connection 48 (Figure 6). The spacing between welded
zones 47 and 48 is the same as the original linear distance between weldedzones welding station 19 need not be spaced fromcutter 16 the same distance as the length of each of thesections - In certain instances, it may be desirable to provide a spring similar to
coil spring 30 but with the wires thereof joined together by welding at only one end of the spring. Such aspring 30′ may be readily formed by simply severing the wires alongstretch 45 at a point immediately in front of the zone of welded connection 44 (Figure 6A). - It is also to be understood that if cutting through a weld is considered undesirable for any reason, each welded
zone 44, 48 may instead be formed as a pair of closely spaced welded portions with the transverse cut byblade 16 extending between the pair of such portions of each weld. - While in the foregoing, embodiments of the invention have been disclosed in considerable detail for purposes of illustration, it will be understood by those skilled in the art that many of these details may be varied without departing from the scope of the invention as defined in the appended claims.
Claims (11)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US168377 | 1988-03-15 | ||
US07/168,377 US4821390A (en) | 1988-03-15 | 1988-03-15 | Multiple-strand torsion spring and method of forming the same |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0333358A2 true EP0333358A2 (en) | 1989-09-20 |
EP0333358A3 EP0333358A3 (en) | 1990-09-26 |
Family
ID=22611270
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19890302196 Withdrawn EP0333358A3 (en) | 1988-03-15 | 1989-03-06 | Multiple-strand torsion spring and method of forming the same |
Country Status (4)
Country | Link |
---|---|
US (1) | US4821390A (en) |
EP (1) | EP0333358A3 (en) |
JP (1) | JPH01254334A (en) |
KR (1) | KR890014186A (en) |
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US5454249A (en) * | 1992-06-19 | 1995-10-03 | Reell Precision Manufacturing Corporation | Spring toe forming device and method |
EP0666612B1 (en) * | 1994-02-04 | 2001-10-24 | Orbital Sciences Corporation | Self-deploying helical structure |
US5639074A (en) * | 1996-03-05 | 1997-06-17 | Smalley Steel Ring Co. | Interlaced wave spring |
DE19938456C1 (en) * | 1999-08-13 | 2001-02-15 | Bosch Gmbh Robert | Process for the production of piezo actuators with a multilayer structure of piezo elements |
US7168117B2 (en) | 2003-02-19 | 2007-01-30 | Dreamwell Ltd. | Multi-stranded coil spring |
CN102009109A (en) * | 2009-09-08 | 2011-04-13 | 上海航天设备制造总厂 | Manufacturing method of large torsion spring |
US8678157B2 (en) | 2011-05-25 | 2014-03-25 | Gates Corporation | Isolator decoupler |
US9291253B1 (en) | 2015-03-24 | 2016-03-22 | Gates Corporation | Isolating decoupler |
CN107470518B (en) * | 2017-08-14 | 2019-10-25 | 福建永动力弹簧科技有限公司 | A kind of Rectangular Spring winding equipment |
US11701699B2 (en) * | 2019-09-23 | 2023-07-18 | Horace Thompson | Helicoidal blade manufacturing system and method |
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---|---|---|---|---|
DE815907C (en) * | 1950-01-01 | 1951-10-04 | Motorrad U Fahrradteilefabrik | Suspension for vehicles, especially for motorcycle forks |
US2668615A (en) * | 1951-03-23 | 1954-02-09 | Torrington Mfg Co | Means for simultaneously feeding two wires |
DE937924C (en) * | 1954-03-19 | 1956-01-19 | Rudolf Dipl-Ing Schenk | Tension spring |
US2929135A (en) * | 1954-05-18 | 1960-03-22 | Stahlwerk Kabel C Pouplier Jr | Process for manufacturing multiple coil springs for slide fasteners and method of attachment |
US3905403A (en) * | 1973-12-26 | 1975-09-16 | Kuhlman Corp | Methods of manufacturing dual interlocked safety spring assemblies |
DE3744640A1 (en) * | 1987-12-31 | 1989-07-13 | Hans Maus | Method for winding (coiling) helical springs |
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US2670797A (en) * | 1948-10-07 | 1954-03-02 | Arthur L Armentrout | Gripper |
US2845693A (en) * | 1953-12-11 | 1958-08-05 | Gen Motors Corp | Method of manufacture of welded electrical terminals |
JPS5828030A (en) * | 1981-08-10 | 1983-02-18 | Aisan Ind Co Ltd | Coil spring |
US4682394A (en) * | 1985-08-27 | 1987-07-28 | Leggett & Platt, Incorporated | Bedding and seating product having double twist coil spring and method and apparatus for manufacturing the same |
-
1988
- 1988-03-15 US US07/168,377 patent/US4821390A/en not_active Expired - Fee Related
-
1989
- 1989-02-23 JP JP1042018A patent/JPH01254334A/en active Pending
- 1989-02-28 KR KR1019890002433A patent/KR890014186A/en not_active Application Discontinuation
- 1989-03-06 EP EP19890302196 patent/EP0333358A3/en not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE815907C (en) * | 1950-01-01 | 1951-10-04 | Motorrad U Fahrradteilefabrik | Suspension for vehicles, especially for motorcycle forks |
US2668615A (en) * | 1951-03-23 | 1954-02-09 | Torrington Mfg Co | Means for simultaneously feeding two wires |
DE937924C (en) * | 1954-03-19 | 1956-01-19 | Rudolf Dipl-Ing Schenk | Tension spring |
US2929135A (en) * | 1954-05-18 | 1960-03-22 | Stahlwerk Kabel C Pouplier Jr | Process for manufacturing multiple coil springs for slide fasteners and method of attachment |
US3905403A (en) * | 1973-12-26 | 1975-09-16 | Kuhlman Corp | Methods of manufacturing dual interlocked safety spring assemblies |
DE3744640A1 (en) * | 1987-12-31 | 1989-07-13 | Hans Maus | Method for winding (coiling) helical springs |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110712180A (en) * | 2019-10-17 | 2020-01-21 | 昆山隆泰汽车配件有限公司 | Torsional spring pre-tightening equipment |
Also Published As
Publication number | Publication date |
---|---|
US4821390A (en) | 1989-04-18 |
EP0333358A3 (en) | 1990-09-26 |
KR890014186A (en) | 1989-10-23 |
JPH01254334A (en) | 1989-10-11 |
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